Had this stove going for 3 hrs and finally got it up to 4oo.Secondaries really don't wanna go and when they do they go right back out after a few rolling burns.Meter says moisture is below 25% but wood was just a little punky from a dead birch that had been standing for 2 yrs dead and cut split and dried for 2 months but it's been damp lately.Had 2 good drying days then brought in and burnt.Here's the results.Thinking the punky wood drew moisture to the core.Wood is covered now after 2 days of NW wind and sun.Think next time i'll try the stuff i split and checked the moisture content.